REF543

Overview

REF543 is an ABB feeder terminal that integrates protection, control, and measurement functions for power distribution systems.

Identification

• Product No.: REF543

• Type: Feeder Terminal

• Manufacturer: ABB

General Function Blocks

• INDRESET: Resets operation indicators, latched output signals, registers, and disturbance recorder waveforms

• MMIWAKE: Activates MMI backlight

• SWGRP1…SWGRP20: Switchgroup functions for flexible control

Measurement Functions

• Analogue input (MEAI1…8): Measures general purpose DC/AC voltage signals via RTD/analogue module

• REAL type input: Monitors internal IEC 61131‑3 based signals (e.g., RTD/analogue data)

• Voltage inputs (GE1…3): DC/AC measurement range −10000.00000…10000.00000

Analogue Output Functions

• Outputs (MEAO1…4): Scales internal REAL type IEC 61131‑3 signals to selectable ranges (0–20 mA or 4–20 mA)

• REAL type input range: −10000.00000…10000.00000

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